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Sealtech Vietnam - Bandlock 2 Closure Spares
40" Bandlock 2 Small Section Seal HNBR
P/N / SKU: 3131-0017-18 | Nominal size: 40" | Profile: Small Section
This is a dedicated quick-opening closure seal profile. It should not be replaced with a standard O-ring or a generic rubber ring simply because the measured diameter appears similar.
40" Bandlock 2
Small Section
HNBR
Quick Opening Closure
Part No. 3131-0017-18
Contents: Images · Overview · Identification · Technical points · Applications · Selection guide · FAQ
1. Product image and Bandlock 2 seal location
2. Product overview
40" Bandlock 2 Small Section Seal HNBR is a dedicated Bandlock 2 closure seal for a nominal 40-inch closure and belongs to the 3131 family. The complete Part No. 3131-0017-18 identifies the Small Section profile together with the HNBR material/designation.
For Small Section identification, a clear cross-section photo of the old seal and the groove is one of the fastest ways to rule out the wrong family. This larger size requires more attention to groove condition, door alignment and even installation around the full circumference.
For the full family and part-number logic, see Bandlock 2 Seal - Quick Opening Closure Seals. For related applications, see Oil & Gas sealing solutions and Pipeline sealing solutions.
3. Product identification
| Item | Specification |
|---|---|
| Product | 40" Bandlock 2 Small Section Seal HNBR |
| Part No. / SKU | 3131-0017-18 |
| Nominal size | 40 inch |
| Section profile | Small Section - family 3131 |
| Material / designation | HNBR |
| Material suffix | -18 |
| Product group | Quick Opening Closure / Closure Spares / Bandlock 2 Seal |
| Data to verify | Closure model and serial number, groove, process fluid, temperature, pressure class and old seal sample |
Compound note: HNBR is often selected for improved heat, mechanical and oil resistance compared with standard NBR, but final compatibility depends on fluid, temperature and the exact compound.
4. Technical points for Part No. 3131-0017-18
Correct 3131 family
The Part No. starts with 3131, identifying the Small Section. Do not substitute family 3232 unless the closure groove has been verified.
The Part No. starts with 3131, identifying the Small Section. Do not substitute family 3232 unless the closure groove has been verified.
Correct 40" nominal size
Sequence 17 in this family corresponds to the 40-inch nominal size. Adjacent closure sizes use different base codes.
Sequence 17 in this family corresponds to the 40-inch nominal size. Adjacent closure sizes use different base codes.
Correct -18 suffix
The suffix identifies the material/designation variant in the source list, so the complete Part No. should be retained when purchasing spares.
The suffix identifies the material/designation variant in the source list, so the complete Part No. should be retained when purchasing spares.
Better spare-parts control
Recording size, section, material and SKU on the BOM helps prevent incorrect seals from being issued where several closures are installed.
Recording size, section, material and SKU on the BOM helps prevent incorrect seals from being issued where several closures are installed.
Closest selection risk
Pressure testing must follow the approved closure and plant procedure and should only be carried out after the locking and safety systems have been verified.
For 3131-0017-18, cross-check the same nominal size in the opposite section family and the adjacent sizes before releasing a purchase order.
5. Typical applications
40" Bandlock 2 Small Section Seal HNBR is used to seal quick-opening closure doors on pig launchers, pig receivers, filter housings, separators, pressure vessels and other closure assemblies that are opened periodically for inspection, cleaning or removal of internal equipment.
At a nominal size of 40", this item falls into the category of large-diameter oil and gas closures. The compatibility of HNBR must be checked against the actual process fluid and operating conditions rather than assumed from the polymer name alone.
If the original spare is obsolete or a custom replacement is required, see Make To Ordered Parts - custom sealing components. Related elastomer references are available under O-Rings & O-Ring Cord and Industrial Gaskets.
6. How to select the correct 40" Bandlock 2 Small Section Seal HNBR
| Step | Check | Why it matters |
|---|---|---|
| 1 | Match Part No. 3131-0017-18 | Confirms the family, size code and material suffix. |
| 2 | Confirm the 40" closure size | Prevents confusion with adjacent nominal diameters. |
| 3 | Confirm Small Section | Small and Large Section seals use different groove profiles. |
| 4 | Verify HNBR | Material selection directly affects fluid and temperature compatibility. |
| 5 | Inspect the groove and old seal | Helps identify deformation, burrs, corrosion or an incorrect section. |
| 6 | Check the interlock and closure condition | A new seal cannot correct mechanical faults in the door or locking system. |
Safety: Bandlock 2 is a pressure-vessel closure. Remove or install the seal only after the equipment has been isolated, vented, drained and verified at zero pressure in accordance with the correct closure manual and the plant safety procedure.
7. Related products and categories
- 40" Bandlock 2 Large Section with the same material suffix
- 38" Small Section with the same material suffix
- 42" Small Section with the same material suffix
- Bandlock 2 Seal - 8" to 60" part-number guide
- Make To Ordered Parts - custom seals from samples or drawings
- O-Rings, O-Ring Cord and elastomer materials
- Industrial Gaskets
8. FAQ for Part No. 3131-0017-18
What is Part No. 3131-0017-18?
It is the Part No. for a 40" Bandlock 2 Small Section Seal with the HNBR material/designation and suffix -18.
Can 3131-0017-18 be replaced by 3232-0017-18?
Not by default. The two codes belong to different section families and use different groove profiles even though the nominal size and material suffix are the same.
Can this seal be selected only by the 40" nominal diameter?
No. The Small Section, suffix -18, closure model/serial number and groove should also be confirmed because the same nominal diameter is available in another section family.
When should Part No. 3131-0017-18 be replaced?
Replacement should be considered when the seal is hardened, cracked, swollen, flattened, cut, permanently deformed or leaking after groove and closure-mechanism faults have been excluded.
What if the source list does not fully identify the material compound?
The material designation is stated in the source list, but the exact pressure and temperature limits still need to be confirmed for the closure and process fluid.
9. Technical support and quotation
Sealtech Vietnam can cross-reference 3131-0017-18, verify the Bandlock 2 section profile and review the old sample, groove, fluid, temperature and pressure information before quotation.
